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opensslGCM: preallocate buffer space, improves performance by 11% 

Results of cryptfs/openssl_benchmark.bash :

Before:
  BenchmarkEnc_OpenSSL_4k_AES256_nonce96-2 	   50000	     31802 ns/op	 127.28 MB/s
  BenchmarkEnc_OpenSSL_4k_AES256_nonce128-2	   50000	     32110 ns/op	 126.06 MB/s

After:
  BenchmarkEnc_OpenSSL_4k_AES256_nonce96-2 	   50000	     28612 ns/op	 141.47 MB/s
  BenchmarkEnc_OpenSSL_4k_AES256_nonce128-2	   50000	     28613 ns/op	 141.47 MB/s
This commit is contained in:
Jakob Unterwurzacher 2015-12-08 13:22:57 +01:00
parent c6a6641b58
commit f4ae0304af
1 changed files with 5 additions and 1 deletions
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6
cryptfs/openssl_aead.go
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@ -25,7 +25,11 @@ func (be opensslGCM) NonceSize() int {
// time, for a given key.
func (be opensslGCM) Seal(dst, nonce, plaintext, data []byte) []byte {
cipherBuf := bytes.NewBuffer(dst)
// Preallocate output buffer
var cipherBuf bytes.Buffer
cipherBuf.Grow(len(dst) + len(plaintext) + AUTH_TAG_LEN)
// Output will be appended to dst
cipherBuf.Write(dst)
ectx, err := openssl.NewGCMEncryptionCipherCtx(KEY_LEN*8, nil, be.key, nonce)
if err != nil {